10... d8c7 I didn't know this move. I used to play 10...d6, when White is slightly better but it's not a big deal. 11. f1e1 This prevents 11...Ng4, which can simply be answered by 12.h3, but allows Black to play 11...d5. 11... d7d5  12. c4c5 The only way to fight for an advantage. 12... b6c5 